Application of prepared adhesive to webs



Feb. 20, 1945. o. c. ROESEN APPLICATION OF PREPARED ADHESIVE TO WEBSFiled Oct. 9, 1941 n x me T0 2 w. M m 0 5 ATTORNEYS use by web-consumingapparatus.

Patented F eb. 20, 19 45 UNITED STATES PATENT oFF-Ica zssasoomucarron orPREPARED ADHESIVE a -ro wuss Application October 9, 1941, Serial No.414,274

3Claims.

.This invention relates to the application of coatings to webs ofpapenor like flexible sheet ma terial, and more particularly concernsimprovements in the application of prepared adhesive and othercoatingsto the surfaces of such webs while continuously winding theminto rolls for One operation in which my invention is. useful is theapplication of adhesive coatings, and in certain casesadhesive-repellent coatings, to, an

area of paper or other web which lies at or adjacent the central coreend of the web on a web roll. I-have heretofore devised a method andapparatus for splicing the web running from an expiring web roll to theleading end of the web on a new roll which involves the application ofan adhesive, and, in some cases an adhesive repellent, to areas adjacentthe inner or core end of the web on the roll. The method and apparatusso devised are described in detail-in my copending application SerialNo. 403,515. filed July 22, 1941, now Patent No. 2,320,656. Inaccordance with the invention disclosed in that application, I

layers of a special self-sticking adhesive are located respectivelyatth'e outer or leading end of the web and at or adjacent the inner orcore end of the web on each roll. The self-stickingadhesive layers mustbe applied in liquidform and thereafter dried until their surfaces donot adhere to an uncoated' web surface. The outer or leading endadhesive layer may be readily applied to the new web roll after itiswound up, either by applying the adhesive'directly to the web on theroll it thereon, vor by. splicing to the leading end of such web a shortweb section carrying the desired adhesive layer. The complementaryadhesivelayer at or adjacent the inher or core end of the web on theroll obviously cannot be applied afterthe roll is wound up, and

the application and drying of this material or of other coatings whilethe roll is being wound sometimes pres'ents dimculties Paper W118 arecustomarflrformed by the inner or core end of the web on the rollc.

winding the web, emerging from thecalender or other final finishingdevice of a paper making. machine or the web from a large parent rollonto suitable cores, the web being severed when each roll reaches thedesired sizeand the severed end of the webbeing started Dna'new corewithout 50 opposite that bearing the adhesive, the repellentcoatingpre'ferably extending slightly beyond the adhesive coating towardthe core end of the web interrupting the continuous and rapid movementofthe web. It is essential to convenient handling and economicproduction that the web move continuously to the winding device and thatits speedof travel .be maintained uniform throughout the Q terial towhich the coated sheets are. applied may winding operations-and whilethe web is shifted from a completed-roll to a new core.

In accordance with the present invention, the

self-sticking adhesive layer or other similar coat- 5 ing tobe appliedin liquid iorm and dried before winding the roll, isapplied to and driedon thin sheets of paper or like material, and one of these sheets issecured to the web surface as it travels at a high velocity to the rollwinding device. The invention also contemplates the provision of acontrol mechanism that acts to correlate the application of-the preparedcoating-carrying sheet with the starting of anew roll so that thecoating x isdisposed at or adjacent the inner or core end of the web oneach roll. x

Other objects, advantages and characteristic features of the inventionwill be pointed out or .will become apparent as the description of thedisclosed embodiment thereof progresses. In describing the invention indetafl, reference will be made to the accompanying drawing in which atypical embodiment thereof has been illustratech In the drawing:

accordance with the invention;

Figs. 2 and 3 are simplified elevations, showing the roll-windingmechanism in different, operatso ing positions;

- Fig. ,4 is a perspective view of the cylinder em- I played to applythe prepared coating-carrying sheet to the web; and

- Fig. 5 is an edge view of a coating-carrying sheet.

The present invention contemplates the application of a prepared coatedsheet to at least one 1 surface of a rapidly moving web running to aroll.-

winding device and the synchronization of the 40 application of suchcoating with the transfer of the web from a completed roll to ecore of anew roll in such' fashion thatthe s ctionoffthe web bearing thecoatedsheet lie 'at or adjacent ;.ly1henthe coating comprises an adhesive, theprepared sheet is preferably applied to that surface of the web whichbecomes the innersurface of I each tum. of the wound roll. In certaincases, an

adhesive repellent is applied to-the web surface on each-r611 for apurpose hereinafter explained;

be supplied from a paper-making machine generally indicated at F'in Fig.1, or from a large parent roll 8. I have illustrated at I the usualdrying drums of the paper-making machine F which may be of theFourdrinier type. The paper web 9 is continuously formed in a knownmanner by the machine, and is dried onthe drums I from which it passesto the usual calender C where its surface is finished.

The rapidly moving web 9 issuing from the calender C or from the parentroll 8 is guided by suitable rollers, Ill, I l and !2, past an adhesivesheet applying device designated S and to be described, to a rollWinding device designatedR. The device R may take any suitable form andgenerally is so designed that it winds the web 9 into a succession ofweb rolls of the desired size, severing the web running to asubstantially completed roll and starting the severed end on a core tostart the winding of a new roll without interrupting or retarding therapid continuous movement of the web. .Various forms of web roll windingdevicesfor accomplishing these functions are known, and any of suchknown forms may be used within the scope of the present in? vention.

The winding device R illustrated is of the type generally termed a Poperewinder and since its construction and operation are well known, itwill be but generally described herein.- The details of such a, deviceare set forth in the Pope Patent No. 1,248,542. As illustrated in Figs.1, 2 and 3, the device R includes an under roll i4 which is suitablydriven at a speed such that its prising the arms l9 pivoted at a pointabove the axis of the under roll M and a running frame comprising a pairof arms 2|] pivotally supported in the bed frame 2| at one side of theunder roll H. The arms l9 have bifurcated ends 2l constructed to receivethe joumal' boxes l8, and the arms 20 have recesses 25 for receiving andengaging the core roll journals [1 as shown in Fig. 3.

In operation, while a web roll 26 is being wound on one of the corerolls I5 whose journals I! are carried by the running frame arms 20, asecond core roll i6 is placed in the starting frame arms [9 and disposedin the ready position as shown in Fi 1 with the core surface out ofcontact with 1 the web passed over the under roll I. When the web roll26 has reached the required size, the arms l9 are swung back to thestarting position (Fig; 2) so that the core roll l6 engages the movingweb backed by the under roll l4 and the core is acthe recesses of therunning frame arms 20. As thenew roll 23 builds up, the journal boxes l8are lifted from the bifurcated ends 2'1 of the starting frame arms 19whereupon these arms are swung back to the ready position (Fig. l) toreceive a new core in preparation forthe next web transfer operation,thus completing the cycle.

The device S acts to apply to the web 9 a prepared sheet (Fig. 5)carrying an applied and dried coating 3| on the surface thereof whichbecomes the exposedsurface when the sheet is secured to the web. Thesheet may be formed of any thin flexible material such as thin paper,thin transparent sheets of degenerated cellulose or cellulosederivatives or the like. The coating 3! may comprise any coatingmaterial which is applied in liquid form and dried. The invention isparticularly applicable to the preparation of paper web rolls for use inprinting presses, and in such' application, the coating 3| preferablycomprises a self-sticking adhesive such as a rubber cement. Suchmaterials are described in detail in my Ycopending application SerialNo.

403,515, referred to above. As there explained,

adhering tenaciously to a paper or other web when applied thereto inliquid form, but when The under roll l4 coop-' celerated to web' speedby such engagement. The

web is then severed at a point between the core l3 and the completedroll 28, preferably by a blast of compressed air issuing from a nozzle21 and directed beneath the edge of the web carried on the under roll Il, andthis air blast, aided if starting frame arm is are swung in thedirection of web travel to the transfer position (Fi 3) in which thejournals ll of the core I 6 rest in dried, do not adhere to an uncoatedweb surface. After the self-sticking adhesive is applied and dried, it'coheres' tenaciously with a similarly applied and dried coating.

The coating 3i may be applied to the sheet til in any desired manner asby spraying or by wiping from a blade, roller or the like. The appliedcoating is dried on the sheet by exposure to heated air currents or inany other known fashion. A tacky adhesive 32, which may comprise rosinglue, paste or the like, is applied to a part or all of the surface ofthe sheet 30 which engages the web 9. The tacky adhesive may be appliedbefore the sheet is placed on the applying device S or afterward.

Referring now to the sheet applying device S. it includes a largediameter light-weight cylinder 33 rotatably mounted with its cylindricalsurface adjacent one surface of the web 9 and its axis extendingtransversely of the path of web travel. The cylinder 33 is preferablydriven at a speed such that its peripheral velocity equals or sub-zstantially equals the web speed, and this may be accomplished by adriving connection, diagrammatically illustrated at 34, between thecylinder shaft and a driven web engaging part of the paper machine orthe drive for the parent roll 8, A clutch or the like, illustrated at34', is preferably included in the driving connection for the cylinder33.

The web 3, guided by the idler rollers II and I2, is normally spacedfrom the surface of the cylinder 33 as shown and a movable press roller.mounting the roller 35 in a vertically movable frame carried orpropelled by apiston 36 in a fluid pressure cylinder 31. The operationof thepiston 36 is governed by a solenoid operated valve 33 which whenopened by energization of .its solenoid 39 admits compressed air orother pressure, fluid from a suitable source to the cylinder 31 and solifts the piston 36 and the press ingroller 35 with the result that theweb pressed against the cylinder 33.. Upon de-energization of thesolenoid 39, the valve 38 cuts oif the fluid pressure and vents thecylinder 31 so that the roller 35 drops and the web 9 is retracted fromthe cylinder 33.

Compressed air is supplied to the nozzle 21 and 23 of the windin deviceR under control of a valve 40 operated by a solenoid 4| which opens thevalve when energized. The solenoids 39 and 4| may be simultaneouslyenergized from a circuit running from a source of energy illuss tratedby the positiveand negative signs, through a manually operable pushbutton switch 42,.wires 43, 44, 45 and 46, a timing switch 4'!controlled by the angular position of the cylinder 33, and a wire 48.

While the web 9 is travelling to a roll such as the roll 28 on thewinding device R,'the cylinder 33 is stopped by opening the clutch inits driving connection and a sheet 30, prepared as explained above, isremovably secured to the cylinder surface in the manner to be described.The surface of the sheet 30 that engages the cylinder surface carriesthe dried coating 3 I, which may be a selfsticking adhesive. The sheet30 is preferably approximately a wide as the web 9, and is of suflicientlength to form a coating extending along the required length of web. Thecircumference of the cylinder 33 is appreciably greater than the lengthof the sheet 30 so that a portion of the cylinder surface is left bareas shown-at 58. The sheet may b removably secured to the surface of thecylinder 33 by any known suitable means. In the disclosed embodiment,each end of the sheet 30 is secured to the cylinder by frangible summedtabs but a weak adhesive between the under surface of the sheet and thecylinder surface may be used if desired. The

circuit across the timing switch 41 through the wires 60 and BI and thecontacts 62 which are closed upon energization of the solenoid 41. As

' the cylinder 33 rotates, the outer surface of the opposite ends of thetabs 51 illustrated are respectively stuck to the outer surface of thesheet ends and the adjacent cylinder surface, and a weakened portionsuch as a line of perforations .52 separates the tab ends so that thetabs tear along this line and release the sheet from the cylinder whenthe sheet is stuck to the web 3. Frangible tabs of this type aredescribed in detail in U. S. Patent No. 1,996,497.

The timing switch 47 is arranged to close the circuit between the wires46 and 48 only when the bare section 50 of the cylinder 33 is oppositethe pressing roller 35. As shown, this maybe accomplished by providing aconducting segment 53, electrically connected through-the roll shaft orotherwise to the wires and 43 and engaged byv a stationary contact 54connected to the wire 48. The sector 53 is diametrically opposite thebare section of the cylinder 33 and is of equal angular extent thereto.

With a prepared sheet 30 removably secured to the cylinder 33, thedriving connection for the cylinder is established and the cylinderisaccelerated to web speed. When the roll 26 has reached the desiredsize, the'operator closes the push button switch 42 and holds it for aninter-.

val. As soon as the bare section 53 of the cylinder surface is tangentto the moving web 3, the timing switch 41 closes and the solenoids 39and 4! are energized. Energization of the solenoid 39' results in upwardmovement of the pressing roller 35 whereby the web 9 is firmly pressedagainst the bare surface of the cylinder 33. Energization of thesolenoid 4| severs the web 9 on the Winding device R and transfers thesevered end thereof to a new core I6 to start winding a. new roll asexplained above, and closes a. holding sheet 30 carrying the tackyadhesive 32 is pressed on and stuck to the web 9,. the frangible tabs 51are broken and the sheet 30 peels off the cylinder 33 and travels alongwith the web. This places the coated sheet adjacent the inner or coreend of the web forming the roll wound on the core IS. The describedoperation may be repeated each time the web -is transferred to a newcore to start winding a new roll.

If necessary or desirable, the tacky adhesive 32 may be dried by hotairor other known means acting in a stationary drier 49 surrounding the webbetween the sheet-applying device S and the winding device R. 1

A web carrying a dried coating of the selfsticking adhesive referred toabove may be wound into a roll without adherence between the coatedsurface and the uncoated surface of the superposed layers. Sinceadhesives and coatings other than the described self-sticking adhesivemight be used, and in any case to positively insure against adherencebetween adjacent roll layers, it is frequently advisable to apply arepellent coating to the opposite surface of the web 9 from thatcarrying the prepared dried coating. The repellent may comprise anadhesive repellent such as paraiiin or any other suitable wax orwax-like composition, and it is preferably applied in solution and driedby the drier "49.

Since the coating onthe sheet 33 is applied to the web surface whichbecomes the inner surface of each layer on the roll, the repellentcoating repellent to the under surface of the web 9 by a deviceidentical with the prepared coating sheet applying device S describedabove. It is generally simpler however to spray the repellent onto theunder surface of the web 9 as illustrated from a reservoir 53 through aspray nozzle blunder control of a solenoid 58 which when energized opensa valve 59 and supplies compressed air to the nozzle 57. The solenoid 58is connected as shown in parallel with the solenoids 39 and ti andaccordingly is energized simultaneously therewith. The nozzle 5? isspaced ahead of the cylinder 33 a distanc sufiicient to provide therequired lead of-the repellent coating over the adhesive-carrying sheet33, for the purpose explained above.

From theforegoing description it will be seen that by employingthepresent invention, a prepared and dried coating of adhesive or othermaterial may be applied to a moving web surface in predeterminedrelation to thecoreend of a web roll during winding of the roll andwithout in= terrupting or retarting either the production or feeding ofthe web for'the winding operation.

Iclaim:

1. A method of applying adhesive sheets to a continuously moving webwhile winding the same into web roll with the adhesive sheets adjacentthe core end of each roll comprising propelling the web to a roll beingwound, moving a sheet carryinga dried adhesive coating on one surfacethereof and a tacky adhesive on the other surface into web rolls withthe adhesive sheets adjacent the core end of each roll comprisingpropelling the web to a roll being wound, moving a sheet carrying adried adhesive coating on one surface thereof and a tacky adhesive onthe other sur-' face thereof at substantially the speed of the web in thdirection of web travel with the tacky adhesive carrying surface of thesheet adjacent one surface of the web, pressing the sheet and the webtogether to stick the sheet onto the web and simultaneously applying anadhesive repellent coating to the other surfaceof the moving web andtransferring the moving web to a core to start winding'a new roll.

3. A method of applying adhesive sheets to a continuously moving webwhile winding the same into web rolls comprising propelling the web to aroll being wound, moving a sheet carrying a dried adhesive coating onone surface thereof and a tacky adhesive on thecther surface thereof atsubstantially the speed of the web in the direction of web travel withthe tacky adhesive carrying surface of the sheet adjacent one surface ofthe web, pressing the sheet and the web together at a predeterminedpoint in the web path to stick the sheet onto the web and simultaneouslyapplying an adhesive repellent coating to the other surface of the webfrom a fixed point adjacent the web and in advance of said predeterminedpoint in the direction of web travel and transferring the movingweb to acore to start winding 9. new r011.

OSCAR C. ROESEN.

